Computer reboots spontaneously

I am running win xp sp2. Computer is about 5 years old. 40 GB WD and 512 MB
RAM. Everything was working fine.

Starting this morning, and at intervals of about one hour, my computer makes
a short buzzing sound, the screen goes dead, and the computer then reboots.

When it reboots, it does not show the blue screen, asking for a disk check.
Normally it asks for a disk check when the power is interrupted like this.

The status report on the hard drives shows OK when the computer boots.

I checked the temperature in the BIOS and it looks OK: CPU 40C/104F, System
34/93, fan speed holding steady with slight speed variations.

What diagnostics can I run? What can cause this problem.

Thanks for any help

--
Walter
www.rationality.net
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